| 摘要 |
PURPOSE:To reduce the distrurbance noises of a control unit, by connecting an RC filter and an NPN transistor between a battery and the base of a PNP transistor and therefore turning on stably the PNP transistor. CONSTITUTION:An ignition key 11 and the emitter of a PNP transistor TR12 are connected to a battery 10. The terminal of the other side of the key 11 is connected to the base of an NPN TR17 via an RC filter consisting of a resistance 13 and a capacitor 14 and a resistance 15. The base of the TR12 is connected to the collector of the TR17 via a resistance 18. A control unit 19 is connected to the collector of the TR12. The time constant is properly set for resistances 13 and 15 and the capacitor 14 in order to inhibit the generation of a pulse that causes a malfunction of the unit 19 even though the key 11 has a hit. |
